PHILADELPHIA — Matt Harvey has retired.

Jacob deGrom, after signing his megadeal with the Rangers, is out with a second Tommy John surgery.

Noah Syndergaard is dealing with a blister issue and a 7.16 ERA with the Dodgers in his attempt to come back from his own Tommy John surgery.

Steven Matz is in the midst of another rough season in St. Louis.

And then there’s Zack Wheeler, the only one of the former young Mets pitchers who were supposed to lead the organization to years of success who has stayed healthy and productive.

Wheeler, scheduled to start against the Mets on Sunday at Citizens Bank Park after his team beat New York in the opener on Friday, knows all too well the hardships his ex-teammates have faced.

“It was a lot of fun to be part of that group and we had a lot of expectations,’’ Wheeler said Friday. “I definitely wonder about what could have been. Everyone does: the fans, the media and us.”

It still stings as a missed opportunity.

“I think we could have done something special in New York,” he said.

“I mean, we got to a World Series, which is a success, I think, but we all thought it would last longer.”

Wheeler actually missed that 2015 run to the World Series after he had Tommy John surgery that spring.

Now, he’s still standing, having just hit the 10-year milestone in the majors.

And although he’s in Philadelphia, Wheeler still rues what could have been at Citi Field.

“I think we made a few turns through the rotation together while we were there,’’ Wheeler said with a laugh.

“It did seem like someone was always hurt. It was unfortunate.”

He likened the mixed fortunes of that group to another cautionary Queens tale regarding pitchers who were supposed to dominate, but ended up being a disappointment.

“It was like Generation K before us,” Wheeler said.

While Wheeler, 33, wasn’t familiar with the details of the trio of Bill Pulsipher, Jason Isringhausen and Paul Wilson, he knew enough about how they fell short of the hype with which they entered the majors in the mid-1990s.

“And there were only three of them,’’ Wheeler said. “We had five of us. We were looking at a complete rotation. That would have been tough for a team to face every day for five days, but we weren’t able to accomplish it. It’s unfortunate.”

Wheeler has pitched well in four of his last five outings for a Phillies team that made it to the World Series last season and is trying to gear up for a second-half run for a second consecutive year.

“We’re going to have to do that if we want to get to where we want to go,’’ Wheeler said of the Phillies, who entered Friday 38-36.

Wheeler said he continues to keep an eye on his former rotation-mates.

“You talk to guys and see names in the news and it’s been a lot of tough breaks lately,” Wheeler said. “I know what deGrom has to come back from and that Noah is trying to get his velocity back.

“None of it is easy.”

Wheeler dealt with injuries early in his career that kept him off the mound for the entire 2015 season and limited him to just one minor league appearance in 2016 before he returned to the majors in 2017.

“I had a hard time when I was young and it was tough to watch,” Wheeler said. “But you’ve got to keep grinding.”